code: def __doc_proposal_distribution(self, doc, topic):
      return doc.topic_sum(topic) + self.__model.alpha()
  
imports: import os
  import numpy
  from tqdm import tqdm
  from paddlehub.common.logger import logger
  from slda_webpage.document import LDADoc, SLDADoc, Token, Sentence
  from slda_webpage.vose_alias import VoseAlias
  from slda_webpage.util import rand, rand_k
label_desc: Use image node_id 10 for calling the MHSampler obj's underlying member method code with example usage: obj.__doc_proposal_distribution(doc, topic) and returns: unknown